The issue of MCS is a controversial one very much like fibromyalgia and chronic fatigue disorder were. Dosen't look like the file is closed on MCS yet.
Exactly ...
Unfortunately ... there are true Quacks like Barrett and others from chemical / pharmaceutical industries funded ACSH who make premature, politically & bottom line motivated medical conclusions ... such as Barrett has done for them in his highly publicized MCS pieces.
By suing and going after doctors and scientists studying this growing medical mystery ... the Quacks are doing all they can to keep the science from evolving while they push their "conclusions" as fact.
This is an old story ... medical suppression has been going on by these same groups for years.